Answer:
b) 689,000mm
as 1m= 1000mm
Answer:
A
Explanation:
mark me brainlisted please
Which state of matter has the most movement of its particles?
Answer:
solids...............
What is an energy
transformation?
A. When energy is destroyed
B. When energy changes from one form to
another
C. When energy is created
D. When energy is lost
bron
Answer:
B. When energy changes form one to another.
Explanation:
Energy transformation, also known as energy conversion, is the process of changing energy from one form to another. In physics, energy is a quantity that provides the capacity to perform work or provides heat.
A more reactive metal displaces a less reactive metal from salt solution. Such reactions are called:
Answer:
Displacement Reaction.
Answer:
displacement reaction
A certain compound has an empirical formula of CH3. What must be true about this compound?
Answer:
A.
It contains three times as many hydrogen atoms as carbon atoms.
B.
It consists of 75% hydrogen by mass.
C.
Each molecule contains exactly four atoms.
D.
Each carbon atom is bonded to three hydrogen atoms.
Explanation:
it has 75% Hydrogen by mass
If we assume CH3 as 100% which is 4 parts.
Then 3 parts corresponds to Hydrogen which is 75% and remains is carbon,25 %
Which is a reason that a chemical engineer would use a rate law for a reaction in a chemical plant?
A. to calculate the amount of product that would form
B. to find out which reactant would be used up fastest
C. to see how a change in a reactant concentration would affect the speed of the reaction
D. to determine how to adjust the concentrations of reactants to make the correct product
Explanation:
to see how a change in a reactant concentration would affect the speed of the chemical reaction
cell are the blank unit of all living organisms
A prescription is written for 500 mL of a 7% NaCl solution. The technician has a 50% NaCl solution. What volume of
50% NaCl is required for the 7% solution?
mL
Answer:
70 mL
Explanation:
To solve this problem we can use the C₁V₁=C₂V₂ equation, where the subscript 1 refers to the concentrated solution while subscript 2 refers to the diluted one, as follows:
C₁ = 50V₁ = ?C₂ = 7V₂ = 500 mLWe input the data:
50 * x = 7 * 500 mLAnd solve for x:
x = 70 mLThus the answer is 70 mL.
Heeeeeellllppp, Iiiimmm sssooo stttuuuccckkk!
Answer:
I think it would be D. None of the above
Explanation:
why I think this is because none of the answers really adds up to it
How many molecules are in 83.2 g of chlorine gas (Cl2)?
Group of answer choices
1.42 x 10^24 molecules
1.78 x 10^28 molecules
7.04 x 10^23 molecules
14.2 x 10^24 molecules
Answer:
try all of them
1.42 x 10^24 molecules
1.78 x 10^28 molecules
7.04 x 10^23 molecules
14.2 x 10^24 molecules
Explanation:
10pts! Will give brainllest! But please make sure your answer is correct.
Which of the following is true about weight and mass?
A.Your weight and mass are the same
B.Your mass would be more on Jupiter because it has more gravitational force.
C.Your weight would be greater on Jupiter because it has more gravitational force.
D.Your weight would be greater on the moon because it has more gravitational force.
Answer:
B. your mass would be more on jupiter because it has more gravitational force.
Explanation:
good luck must be a test
what is an example of a problem that could be solved by applying knowledge of the behavior of light
Answer:
The application of reflection in the use of the microscopes.
Explanation:
Reflection is one of the properties of light. Reflection is a phenomenon whereby light waves hitting a surface is bounced off. Reflection helps us to see light and colors. This behavior of light is harnessed in the design of the microscope.
The light reflected by the microscope helps the researcher to view the specimen in his slide. Also, the mirrors placed in measuring devices reflects light that helps an observer to take an accurate reading.
Something that helps us to understand things that are too large or too small are called A. atoms B. molecules C. models D . compounds
1.52 moles of gas are at a pressure of 99.5kPa and a temperature of 298K. What is the volume of the gas
Answer:
5
Explanation:
answer my last question plz
PLEASE HELP ASAP I WILL GIVE BRAINLIEST!
Which statement describes a catalyst?
A) catalysts appear as reactants in a chemical equation.
B) catalysts are completely consumed by the reaction.
C) catalysts provide a lower energy pathway for the reaction.
D) catalysts speed up chemical reaction by increasing surface area.
Answer:
it's D) catalyst speed up chemical reaction by increasing surface area
Explanation:
sorry if I'm wrong
What is the difference between endothermic and exothermic reaction (shortest answer)
Answer:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An ethothermic process absorbs heat and cools the surroundings. Hope this helped.
The easiest way to explain endo and exothermic reactions are that endothermic reactions absorb energy and exothermic reactions release energy.
The way I remember this is that with exothermic reactions, the heat exits. Endothermic is just the opposite.
Hope this helps :)
How do you know when a redox equation is balanced?
In addition to the two types of motion found in liquids, gases have
What kind of motion
Answer:
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
Please answer this question ASAP
Salts of metals can be prepared by reacting a metal with an acid to produce the
salt and the gas hydrogen. Describe the test to show that the gas is hydrogen.
(2 marks)
Answer:
put a test tube over the opening, remove it and quickly put a lit splint near the mout or in the tube. if you hear a squeaky pop it is hydrogen.
Explanation:
hydrogen ignites in air.
An example of an abiotic factor that would strongly affect the population of water lilies in a pond?
Answer:
temperature, light or pH
Explanation:
Gold has a specific heat of 0.129 J/g °C. How many joules of heat energy are
required to raise the temperature of 23 grams of gold from 22 °C to 98
°C?
Look at picture
ASAP please will mark as brainlist don’t got much time
Answer:
210.657J
Explanation:
joules of heat energy needed= 23×0.129×(93-22)
=210.657J
Water can exist in all three states of matter.
Describe the arrangement and movement of particles in each of the three states of matter. Explain what happens to the particles in a liquid during boiling.
I'll give someone brainly and thanks if they answered the question correctly. 30 points!!
Answer:
The particles in a liquid move very quickly due to heat while it is boiling and gradually turns to gas
A 367.8 g sample of potassium chlorate was decomposed according to the following equation:
2KClO3 -->2KCl + 3O2 How many moles of oxygen are formed?
a 2.5 mol
b 4.5 mol
c 1.0 mol
d 3.0 mol
HELP ASAP!
Which type of molecule provides cells with energy?
Carbohydrate
Nucleic acid
Protein
Water
Answer:
ATP
Explanation:
ATP is the most abundant energy carrier molecule in cells.
basically nucleic acid
Gravity is responsible for the
Orbiting path of the panets around the sun.
Rotation of a planet on its rotation axis.
Tilt of Earth's axis.
Pheses of the moon.
A face centered cubic cell has an edge length of 495 pm. What is that atomic radius?
Answer:
r = ¼a√2
Explanation:
For a face centered cubic cell, which we call FCC, the atoms at the face diagonals touch each other.
Now, If we denote the edge length of cube to be "a" and the radius of the atom is denoted as "r", as seen in the attached FCC cell:
(√2)a = 4r
Divide both sides by 4 to get;
r = ¼a√2
To prepare 800mL of 1M phosphate buffer of pH 7.2 (PKa=7.1), by using salt = K2HPO4 and acid = KH2PO4, the quantity of salt required is
Answer:
78.04g of 0.448 moles must be added
Explanation:
Using H-H equation we can find the pH of the buffer:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer = 7.2
pKa = 7.1
[A⁻] = [K₂HPO₄]
[HA] = [KH₂PO₄]
Replacing:
7.2 = 7.1 + log [K₂HPO₄] / [KH₂PO₄]
0.1 = log [K₂HPO₄] / [KH₂PO₄]
1.2589 = [K₂HPO₄] / [KH₂PO₄] (1)
And as the concentration of the buffer is:
1M = [K₂HPO₄] + [KH₂PO₄] (2)
Replacing (2) in (1):
1.2589 = 1M - [KH₂PO₄] / [KH₂PO₄]
1.2589 [KH₂PO₄] = 1M - [KH₂PO₄]
2.2589 [KH₂PO₄] = 1M
[KH₂PO₄] = 0.44M
And [K₂HPO₄] = 0.56M
In 800mL = 0.8L:
0.8L * (0.56mol / L) = 0.448 moles K₂HPO₄. The mass is -Molar mass K₂HPO₄: 174.2g/mol-:
0.448 moles * (174.2g / mol) =
78.04g of 0.448 moles must be added2. (10 Points) Several fast-acting medications are sold as powders, sometimes
inside soluble capsules. Why would these medications act faster than solid
tablets?
The medications like capsules act faster because of their increased surface area which helps them to absorb quickly.
What is a capsule?Encapsulation in the manufacture of pharmaceuticals refers to a range of dosage form techniques that are used to enclose medicine in a relatively stable shell called a capsule.
The two main types of capsules are Hard-shelled capsules and Soft-shelled capsules. Hard-shelled capsules contain dry, powdered ingredients made by processes such as extrusion, and spheronization.
Soft-shelled capsules are primarily used for oils and for active ingredients that are dissolved in oil. Both types of capsules are made from aqueous solutions of gelling agents, such as animal protein or plant polysaccharides.
The size of particles and the additive properties affect the rate of the dissolution or absorption of the drug. As the surface area of the capsule is greater than the solid tablets so they absorb faster than tablets.
Learn more about capsules, here:
https://brainly.com/question/12845835
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why do animals need carbohydrates in their diets
Answer:
Carbohydrates are energy-providing feed components composed of carbon, hydrogen, and oxygen. They should make up about 75 percent of an animal's diet. The energy they provide powers muscular movements. Carbohydrates also produce the body heat that helps keep the animal warm.
PLS HELP ASAP Solar energy causes most of the water ___________________ on Earth’s surface?
Which statements about salt water are true? Check all that apply.
Salt water contains minerals other than salt.
Fresh water is heavier than salt water.
Objects float more easily in oceans than in lakes or rivers.
The temperature of ocean water is affected by the depth of the water.
The temperature of ocean water is affected by the ocean’s location.
Salt water contains minerals other than salt.
The temperature of ocean water is affected by the depth of the water.
The temperature of ocean water is affected by the ocean’s location.
Objects float more easily in oceans than in lakes or rivers.
These are all of the true answers
Answer:
First one and the last three
Explanation:
hope it helps